Actuating device for a drive arrangement

ABSTRACT

An actuating device for a drive arrangement having a drive transmission operatively connected to a metering structure where a clutch is mounted adjacent to drive transmission, an actuating device is positioned to selectively engage the clutch such that the rotational force transferred from the drive transmission to the metering structure is selectively deactivated when the actuating member engages the clutch.

BACKGROUND OF THE INVENTION

This invention is directed toward an actuating device and moreparticularly an actuating device for a drive arrangement of animplement.

Equipment for planting crops such as corn, soybeans, cotton, peanuts,wheat and the like is well known in the art. Typically, a planter willconsist of a central beam known as a toolbar. Attached to the tool barare individual planting units commonly referred to as row units. Eachrow unit will plant one row and planters come in different sizes havingany number of rows. The toolbar will have a row unit for each row thatis planted. For example, a twelve row planter will have one toolbar with12 individual row units attached thereto.

To deposit seed on the ground a row unit requires rotational force. Therotational force typically is provided by a central drive shaft that isapproximately the same length as the toolbar. The central drive shaft isattached to a drive mechanism that rotates the central drive shaft.There are several different drive arrangements known in the art forrotating the row unit including a chain drive comprising of roller chainsprockets on both the row unit and the central drive shaft and a rollerchain connecting the two. Another way includes a flexible drive shaftconnected to a drive gear and a drive transmission that rotates ametering structure. An example of the second drive arrangement isoutlined in U.S. Pat. No. 4,779,471 by Rettig incorporated by referenceherein in its entirety.

While these known arrangements provide rotational force to the row unit,they do not permit a farmer to plant some rows and not others asselected. Because all row units are driven by a central drive shaft asmentioned above, it is not possible to selectively deactivate some rowswhile allowing others to operate. Therefore, there exists a need in theart for an actuating device that addresses these deficiencies.

An object of the present invention is to provide an actuating devicethat selectively deactivates a row unit.

Another object of the present invention is to provide an actuatingdevice that selectively deactivates a row unit based upon the geographiclocation of a planter as determined by a GPS system.

A still further object of the present invention is to provide anactuating device that requires a small amount of current.

These and other objectives, features and advantages will be apparent toone skilled in the art based upon the following disclosure.

SUMMARY OF THE INVENTION

An actuating system for a drive arrangement where the drive arrangementincludes an implement shaft connected to a drive gear, a drive shaftconnected to the drive gear, a drive transmission connected to the driveshaft, and a metering structure connected to the drive transmission. Thedrive transmission is connected to the metering structure by atransmission drive shaft that is connected to a seed shaft. Fitted overthe transmission drive shaft and the seed shaft is a hollow tube thatrotationally engages a rotational bore within the drive transmission. Aclutch is positioned such that a driver member rotationally engages thehollow tube and the driven member rotationally engages the transmissiondrive shaft. A release ring fits around the driver member and the drivenmember. An actuating member is positioned to engage the release ring.

In an alternative embodiment, a clutch is mounted to the implement shaftsuch that the driver member rotationally engages the implement shaft.The driven member rotationally engages a center member that rotationallyengages a rotational bore within the drive gear. A release ring fitsaround the driver member and the driven member and an actuating memberis positioned to engage the release ring.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of a drive arrangement;

FIG. 2 is a sectional view of an actuating system;

FIG. 3 is a sectional view of an alternative actuating system; and

FIG. 4 is a schematic view of an actuating system.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to the Figures, the actuating device 10 is used in conjunctionwith a drive arrangement 12. While the actuating device 10 may beadapted for use with many types of drive arrangements without departingfrom the scope or spirit of the invention, the following drivearrangement 12 is depicted by way of example only. The drive arrangement12 includes a drive gear 14 that is operatively connected to a driveshaft 16. Preferably the drive shaft 16 is flexible. The drive geararrangement 14 is fixed to an implement shaft 17 (axle or engine) thatprovides rotational force to the drive gear arrangement 14. Connected tothe opposite end of the drive shaft 16 is a drive transmission 18. Thedrive transmission 18 is operatively connected to a metering structure20 such as a row unit which deposits seed on to the ground. Drive istherefore provided from the axle or engine shaft 17 through the drivegear arrangement 14, drive shaft 16 and drive transmission 18 to drivethe metering structure 20 at a speed proportional to the ground speed ofthe implement.

The connection between the drive transmission 18 and the meteringstructure 20 includes a seed shaft 22 that is connected to a meteringdrive 23. Placed over the seed shaft 22 is a hollow tube 24. The hollowtube 24 is not attached to the seed shaft 22 and rather spins freelyabout the seed shaft 22. Placed inside the hollow tube 24 and attachedto the seed shaft 22 is a transmission drive shaft 26. In this manner,the transmission drive shaft 26 and the seed shaft 22 rotate in unisonand the hollow tube 24 is free to rotate about both shafts 22 and 26.The hollow tube is of any shape and is formed to fit within the bore 28of the drive transmission 18 such that when drive shaft 16 is rotatedthe rotational force transfers to drive transmission 18 which causes thedrive transmission 18 and the hollow tube 24 to rotate in unison.Preferably the hollow tube 24 and bore 28 are hex shaped.

Placed over the transmission drive shaft 26 and at least a portion ofhollow tube 24 is a clutch 30. Any type of clutch 30 may be used. Oneexample is a clutch 30 having a driver member 32 that fits over at leasta portion of the hollow tube 24 and a driven member 34 that fits overand is securely attached to the transmission drive shaft 26. The drivermember 32 and driven member 34 are adjacent to one another and arepartially received by a torsion spring (not shown) which in a naturalstate is compressed against members 32 and 34 such that they rotatetogether. Surrounding the torsion spring is a release ring 36. In thisnatural or deactived state, rotational force is transferred from thedrive transmission 18 to the hollow tube 24 and then to the drivermember 32. The torsion spring connects the driver member 32 and drivenmember 34 such that they rotate together which transfers rotationalforce to the transmission drive shaft 26, then to the seed shaft 22which in turn rotates the metering drive 23 of the metering structure22.

Positioned to selectively engage the release ring 36 is the actuatingmember 10. The actuating member 10 is of any type, size, shape, orstructure that permits engagement of the release ring 36. Preferably,the actuating device 10 is pneumatic and is connected to a source ofcompressed air 38. The source of compressed air is of any type includinga 12V portable compressor mounted to an implement or a rechargeableportable tank without a compressor. The source of compressed air 38 maybe electrically connected to a controller 40 that sends a signal toactivate the source of compressed air 38 which in turn activates thepneumatic actuating device 10. The controller 40 may be wirelesslyconnected to a GPS system 42 to permit activation based on geographiclocation.

When activated compressed air is supplied to the actuating member 10such that the actuating member 10 engages the release ring 36. Whenengaged, the release ring 36 releases the compression of the torsionspring (not shown), thus releasing the driver member 32 from the drivenmember 34. When this occurs rotational force is transferred from thedrive transmission 18 to the hollow tube 24, and then to the drivermember 32. The hollow tube 24 spins freely about seed shaft 22 andtransmission drive shaft 26, while the driver member rotatesindependently of the driven member 34 and no rotational force istransferred to the driven member 34. As such, no rotational force istransferred to the transmission drive shaft 26, the seed shaft 22, orthe metering drive 23. Thus, by activating the actuating member 10,rotation of the metering structure 20 is selectively stopped.

In order to selectively and independently activate a plurality ofactuating members 10 a valve module 44 is used. The valve module 44 iselectrically connected to the controller 40 for either manual activationor activation through a conventional GPS system. The valve module 44includes a housing 46 that contains a plurality of valves 48. The valves48 are connected, through the housing 46 to the source of compressed air38 through tube 50. Also connected to each valve 48 at one end is an airtube 52 that is connected to the pneumatic actuating device 10 at theopposite end of the air tube 52. Multiple actuating members 10 may beconnected to each air tube 52 through the use of at least one or moreconnectors 54 such as a Y or T connector. This connection system isknown as “daisy chaining” and allows one to easily connect anddisconnect actuating members 10 from the valves 48 based on the desiredapplication. In this manner a group of actuating members 10 areactivated when a selected valve 48 is activated by the controller 40.

This system is particularly valuable in a planting device. For example,a twelve row planter using a valve module 44 having four valves 48 maybe set to control four sections of three rows each. Should greatercontrol be desired, a second valve module 44 may be added having twovalves 48 so that the modules 44 may be set to control six sections oftwo rows each.

In operation the controller 40 transmits a signal to activate the sourceof compressed air 38 and also selectively activates valves 48 basedeither on a manual command or a geographic location as determined by theGPS system 42. Once activated, valve 48 permits compressed air to travelthrough tube 52 to the actuating member 10 to activate the actuatingmember 10.

In an alternative embodiment the clutch 30 and actuating member 10 arepositioned adjacent the drive gear arrangement 14. Engine shaft 17 isoperably connected to driver member 32 of the clutch 30. The drivenmember 34 is operably connected to a center member 56 of the drive geararrangement 14. The center member 56 has a bore larger than the diameterof engine shaft 17 such that the engine shaft 17 does not drive thecenter member 56. The center member 56 is attached to drive shaft 16such that rotational force from engine shaft 17 is transferred to thecenter member 56 and through driven member 34 to drive shaft 16. Aspreviously described, actuating devices 10 are positioned to selectivelyengage the release ring 36 of each clutch 30. When the actuating member10 in not activated, the torsion spring (not shown) is compressed suchthat the driver member 32 and the driven member 34 rotate together. Whenthe actuating member 10 is activated the release ring 36 engages thetorsion spring to release the compression on the driver member 32 andthe driven member 34. When this occurs, the engine shaft 17 willtransfer rotational force to the driver member 32, but no rotationalforce will be transferred to 34, the center member 56, drive shaft 16,drive transmission 18 or the metering structure 20.

1. An actuating system for a planter, comprising: a drive arrangementincluding an implement shaft operatively connected to a drive gear thatis operatively connected to a drive shaft; a center member thatrotationally engages a bore in the drive gear; a clutch having a drivermember and a driven member positioned within a release ring such thatthe driver member rotationally engages the implement shaft and thedriven member rotationally engages the center member; and an actuatingmember positioned to engage the release ring. 2-3. (canceled)
 4. Thesystem of claim 1 wherein the actuating member is connected to a sourceof compressed air through a valve.
 5. The system of claim 4 wherein thesource of compressed air is connected to a controller that activates thesource of compressed air.
 6. The system of claim 5 wherein thecontroller activates the source of compressed air based on a manualcommand.
 7. The system of claim 5 wherein the controller activates thesource of compressed air based on a geographic location determined by aGPS system.
 8. The system of claim 1 wherein more than one actuatingmember is positioned to engage more than one clutch, and the actuatingmembers connected to more than one valve.